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Finding the Fourth Proportional to 64,490.76, 96,758.82 and 20,128.68

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Solution

The fourth proportional to 64,490.76, 96,758.82 and 20,128.68 is: 30,200.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    64,490.76 : 96,758.82 = 20,128.68 : x
  2. Step 2: Convert to fraction form
    64,490.76/96,758.82 = 20,128.68/x
  3. Step 3: Cross multiply
    64,490.76x = 96,758.82 × 20,128.68
  4. Step 4: Simplify right side
    64,490.76x = 1,947,627,324.96
  5. Step 5: Solve for x
    x = 1,947,627,324.96/64,490.76
  6. Step 6: Final answer
    x = 30,200.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.